Optional ReadonlyariaOptional ReadonlymenusOptional ReadonlymessagesOptional ReadonlyshortcutPrinted shortcuts by item name, from createShortcutManager().labels().
When given it is the single source of truth: an item's own shortcut is
ignored, and an item absent from the map prints nothing, so a label can
never advertise a key that some other binding actually owns.
Translations, keyed
menu.<item name>. Anything missing keeps its English; see defaultMessages for the full list of keys.